Guard dog

[4] Orthrus is a famous example of a livestock guardian dog from the Greek mythology known for guarding Geryon's red cattle.

Some ancient guard dogs in more urban areas, such as the extinct bandogges, were chained during the day and released at night[5] to protect properties, camps and villages.

[4] Some smaller breeds (such as Keeshonden and Tibetan Terriers) are excellent watchdogs, but not guard dogs, because they bark loudly to alert their masters of intruders, but are physically small and not given to assertive behavior.

Guard dogs will bark to alert their master and to warn of an approaching animal or human threat prior to their interception of the trespasser.

Specifically, livestock guardian dogs such as the Kangal use loud alarm barks as a first line of defense against presumed threats; if these do not deter a perceived foe (either human or animal predators), other displays such as bluffing and charging are employed.

The act specifies the requirements of kennels and the need to display guard dog warning signs at the entrance to sites.